OM-D setting preferences
1. OM-D has 3 times faster burst in H mode than E510 has at 9 fps, so you would need a reaction time of about 0.11 seconds to release the shutter button before another shot is taken.
The average reaction time for a human is about 0.2 seconds, so it's no wonder that sometimes you end up taking 3 shots. Set the burst mode to L and you are able to take just one shot. Set the high speed on when you need it.
"The day of the big camera wearing photographer with a large beard and photo vest is over." -Giulio Sciorio